Learning Forum

[Maimuna Nagey]

Hi Guilin Sun! Hi @ALL!

I am a beginner in using fdtd lumerical! I have followed the tutorial for simulating metalens provided here Metalens
I now want to replicate the same approach but replacing the nanopillar with a nanofin, also replace the source has to circularly polarized in order to achieve PB-phase modulation.
I have followed through a previous discussion on the same and got confused! how can the plane wave in the "s_parameter" analysis group be replaced with circularly polarized light?

[Guilin Sun]

You can use a circular polarization with 2 sources. However, how to extract the S value in this case where there are at least two non-zero E field components, near field and the farfield. This is a question you need to think.

[Maimuna Nagey]

in such a case, do I need to use the s_parameter analysis group or I inject the the sources independently?

[Guilin Sun]

I guess that the element does not have the same response for s and p polarization, thus it can be difficult to have ONE S parameter to quantify the result. Due to limited access to the pulications, I do not have any idea how to extract the usful information when the two polarized sources are used, either at the same time or independently. Please search some publication and find a method to quantify such result in order to optimize. This may need more theoretical analysis than simulation. You can use two sources independently and then you get two different S values. You will need to combine them into one value somehow.

There is no such exmaple on line right now.